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🛠️ Seal it, test it, fix it — keep your engine leak-proof like a pro!
The Hromee Engine Air Valve Holder and Cylinder Leakage Testing Assistant Tool is a precision device designed for gasoline engines with M12 or M14 spark plugs, including GM Chevy LS series. It pressurizes cylinders up to 110psi to hold valves closed, enabling oil seal replacement without dismantling. Featuring durable brass fittings and high-pressure rubber tubing, it offers reliable, corrosion-resistant performance. Its quick coupler design ensures fast setup, making it an essential tool for efficient engine leak diagnostics and maintenance.



| ASIN | B0CQLXV7LS |
| Best Sellers Rank | #29,688 in Automotive ( See Top 100 in Automotive ) #17 in Engine Valve Train Tools |
| Brand | Hromee |
| Customer Reviews | 4.4 4.4 out of 5 stars (184) |
| Date First Available | December 19, 2023 |
| Item Weight | 6 ounces |
| Item model number | HR4145 |
| Manufacturer | Hromee |
| Manufacturer Part Number | HR4145 |
| Model | HR4145 |
| Product Dimensions | 6 x 4 x 1.5 inches |
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